I counted 49 pickup trucks with empty beds in the parking garage downtown this morning.

Wouldn't there be a selection bias, as trucks in parking garages are much less likely to be doing hauling /towing tasks?

I counted 50 sedans with empty seats in the parking garage downtown this morning.

Half of them sticking out into the roadway blocking half the lane. What an entitlement.

So? You saw them for one subset of what they are doing. Perhaps the most common one, but still just a subset.